Trees trap toxic traffic dust for us...until the the trees die for us.

Santa Barbara's Oak Park. DT LANGE

Trees,
Parks and Air Pollution

• Poor air quality affects 127 million people in the United
States.

• Air pollution can significantly affect human and ecosystem
health.

• Trees and parks affect air pollution by:

– Reducing air temperatures and consequently pollutant emissions

– Directly removing pollution from the air

– Emitting chemicals that contribute to pollution formation

• Pollution removal by
U.S.urban park trees is on the order of 75,000 tons per year.

Removal of
air pollutants

Trees remove gaseous air pollution primarily by uptake through
the leaves, though some gases are removed by the plant surface.Trees also remove pollution by intercepting airborne particles.Many of the particles that are intercepted are eventually
resuspended back to the atmosphere, washed off by rain, or dropped to the
ground with leaf and twig fall.

Healthy trees in cities can remove significant amounts of air
pollution.The amount of
pollution re­moved is directly related to the amount or air pollution in the
atmosphere.(If there is no air
pollution, the trees will remove no air pollution.) Areas with a high
proportion of tree cover (e.g., parks) will remove more pollution and have the potential for
greater reduction in air pollution concentrations in and around these areas.